/* -*- coding: utf-8 -*-
 *
 * 3038.cc:  No.3038 繧ｷ繝｣繝・ヵ繝ｫ縺ｮ蜀咲樟 - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

/* typedef */

using ll = long long;

/* global variables */

/* subroutines */

/* main */

int main() {
  ll n, k;
  scanf("%lld%lld", &n, &k);

  printf("%lld\n", k - 1);
  
  return 0;
}